Arsene Wenger claims Arsenal have a mole in the camp ahead of Chelsea clash

The Gunners goalkeeper quit Stamford Bridge in an £11m move this summer and has ousted David Ospina as first choice at the Emirates Stadium.

Cech will return to Chelsea, for whom he played for 11 years, for the first time tomorrow and asked if Cech's knowledge was like having a "mole in the camp" he said: "Yes. But there is no big secret other than on the day, perform at your best, and together.

"Our solidarity, our performances will be more important than what he knows.

"There is no massive secret in that.”

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MOLE IN THE CAMP: Wenger agrees Cech (left) is like a mole in the camp

The Czech goalkeeper was rested for the embarrassing 2-1 defeat to Dinamo Zagreb on Wednesday but is expected to start tomorrow.

Hector Bellerin is expected to return at right-back and Aaron Ramsey in midfield at the expense of Mathieu Debuchy and Mikel Arteta respectively.

Per Mertesacker could also be back in the frame after recovering from illness.

Jack Wilshere, Danny Welbeck and Tomas Rosicky are all long-term absentees while Theo Walcott's goal against Zagreb could see him get the nod over Olivier Giroud to lead the line.